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Machining process of high-precision thin-walled pure aluminum or aluminum alloy pipes

A processing technology, aluminum alloy technology, applied in the field of metal materials, can solve the problems of uneven wall thickness, low yield, large shrinkage, etc., and achieve the effects of high quality, shortened production process, and reduced intermediate annealing times

Active Publication Date: 2019-06-21
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to solve the problems of large investment, long process, low yield and high cost of traditional high-precision thin-walled pure aluminum pipe technology
Utilizing the characteristics of uniform heat transfer in the vertical continuous casting direction, the wall thickness of the tube billet can be made uniform, and the problem of uneven wall thickness in the horizontal continuous casting and extrusion process can be solved; by adopting the outer mold with a special structure, the inner surface of the mold has been specially treated Coating treatment, so as to solve the problem of aluminum liquid sticking to the surface of the casting mold; by adopting an outer mold with a short cold section, combined with strong secondary cooling, the temperature gradient of continuous casting can be increased to solve the shrinkage rate when aluminum solidifies A high-precision thin-walled pure aluminum or aluminum alloy pipe processing technology for larger problems

Method used

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  • Machining process of high-precision thin-walled pure aluminum or aluminum alloy pipes
  • Machining process of high-precision thin-walled pure aluminum or aluminum alloy pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Embodiment 1: The production method of the aluminum tube whose size is Ф50×1mm

[0077] Step 1: Use vertical continuous casting to prepare a tube blank with a diameter of Ф70×5mm. The melting temperature of molten aluminum is 810°C, the holding temperature is 770°C, the temperature of the hot mold (mold heating) is 720°C, and the flow rate of cooling water (water-cooled copper sleeve) for the cold mold is 800L / h, traction speed 120mm / min.

[0078] Step 2: Carry out 3 passes of three-roller periodic cold rolling on the tube blank prepared in step 1, the specification of the rolled tube is φ62×1.6mm, the average pass deformation is 28.3%, and the cumulative pass deformation is 53.6%. The pass deformation decreases gradually with the increase of the cumulative deformation.

[0079] Step 3: The annealed pipe is stretched for 4 passes, and the average elongation coefficient of each pass is 1.25.

[0080] Step 4: The stretched pipe is annealed, the annealing temperature is...

Embodiment 2

[0081] Embodiment 2: The production method of the aluminum tube whose size is Ф70×1.5mm

[0082] Step 1: Prepare a tube blank with a diameter of Ф100×7mm by vertical continuous casting, the melting temperature of molten aluminum is 780°C, the holding temperature is 750°C, the temperature of the hot mold (mold heating) is 720°C, and the flow rate of cooling water (water-cooled copper sleeve) for the cold mold is 900L / h, traction speed 100mm / min.

[0083] Step 2: Carry out 3 passes of three-roller periodic cold rolling to the tube blank prepared in step 1, the rolled tube specification is φ90×2.8mm, the average pass deformation is 27.9%, and the cumulative pass deformation is 62.5%. The pass deformation decreases gradually with the increase of the cumulative deformation.

[0084] Step 3: Perform intermediate low-temperature annealing on the rolled pipe, the annealing temperature is 200°C, and the annealing time is 1h. The annealed pipe was stretched for 3 passes, and the aver...

Embodiment 3

[0086] Embodiment 3: The production method of the aluminum pipe whose size is Ф100×2mm

[0087] Step 1: Prepare a tube billet with a diameter of Ф150×8mm by vertical continuous casting, the melting temperature of molten aluminum is 750°C, the holding temperature is 750°C, the temperature of the hot mold (mold heating) is 700°C, and the flow rate of cooling water (water-cooled copper sleeve) for the cold mold is 1000L / h, traction speed 80mm / min.

[0088] Step 2: Carry out 4 passes of three-roller periodic cold rolling to the tube blank prepared in step 1. The average pass deformation is 35.5%, and the cumulative pass deformation is 82.7%. increase gradually decreases.

[0089] Step 3: Carry out bright annealing on the rolled pipe, the annealing temperature is 300℃, and the annealing time is 60min. The purpose is to change the pipe structure to meet the product use requirements.

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Abstract

The invention provides a machining process of high-precision thin-walled pure aluminum or aluminum alloy pipes, and the machining process aims to solve the problems that in a traditional extrusion production process of high-precision aluminum or aluminum alloy pipes, the size precision and the yield are low, and in horizontal continuous casting, the wall thickness uniformity is poor and mold sticking is prone to happening. The method adopts a vertical continuous casting technology to prepare the high-precision thin-walled pure aluminum or aluminum alloy pipe blanks, the solid-liquid interfaceposition is located at the transition area of a heat section and a cold section by controlling the continuous casting and molding, the formed pipe blanks have columnar crystal structures with high inner and outer surface quality and high orientation degree in the continuous casting direction, axial extending deformation of subsequent cold machining like rolling and drawing is facilitated, the continuous cast pipe blanks can be directly subjected to large-deformation cold machining and molding without face milling, short-process production of the high-precision thin-walled pure aluminum or aluminum alloy pipes is achieved, and the problems that in a traditional process of the high-precision thin-walled pure aluminum or aluminum alloy pipes, the investment is large, the process is long, theyield is low and the cost is high are solved.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a high-precision thin-walled pure aluminum or aluminum alloy pipe processing technology. Background technique [0002] High-precision thin-walled aluminum tubes have the advantages of low density, corrosion resistance, and high specific strength, making them good structural materials for aerospace, weaponry, transportation, and other fields. Aluminum is the second largest metal material after steel. With the rapid development of modern aerospace, marine engineering, machinery manufacturing and other technologies, the requirements for aluminum pipes continue to increase and improve. High-precision thin-walled pipes have become the main One of the development trends. The main feature of high-precision aluminum tubes is high surface and dimensional accuracy requirements, for example: the inner surface of the tube is not allowed to have any slight scratches, scratches and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 刘新华谢建新田宇兴刘成王一笑郑志凯
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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